Often I get asked what shall I do with out of season fruits etc. There is nothing you can do to change the weather conditions but do not be tempted to start covering things up too much or you will run into the problem of when to take the covers off.
It really does depend on the weather what if anything you can do this month in your garden. Leeks and parsnips can still be harvested; even when the ground is frozen you can usually break the surface so as to get the crop out.
Sprouts and other cabbage family crops can be harvested as needed.
Watch out for the pigeons if we get snow as the taller crops only may be open for them to see and eat.
Clay type soil can be dug and left rough for the weather to help break down.
Seed potatoes should be laid out in trays with the eyes uppermost so that they can form god strong short spurs ready for planting later , they do need full daylight but frost free conditions.
Your trench for runner beans can be prepared using plenty of compost or rotted manure , so that it has time to settle for planting much later.
You can when the weather is suitable still plant raspberry and other cane fruits,
I would tend to leave potted things like strawberries until a little later when the soil starts to warm.
It is not too late if you want to prune other fruits, most fruit on older wood or spurs so they need to have some of the new growth reduced leaving a good open centre but blackcurrants fruit on wood formed the previous summer so should have been pruned soon after fruiting to encourage new wood.
Red currants, white currants and gooseberries make good cordon plants which will take up much less space. However do make sure they are not a variety that tends to have a weeping habit.
You can check any dahlia or similar tubers that are in store, early chrysanthemums can be started into growth if you have facilities for taking and growing cuttings.
If your indoor hyacinths after flowering are kept watered and frost free they can be planted out in the garden to flower in later years.
Now is a good time to give your daffodils a light dressing of a high potash feed to help with the colour and growth of new bulbs, I generally use Vitax Q4.
You are best to leave the lawns alone in frosty cold weather unless there are still some leaves to clear.